server/file.c

   1 /*
   2  * Server-side file management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <fcntl.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31 #ifdef HAVE_SYS_ERRNO_H
  32 #include <sys/errno.h>
  33 #endif
  34 #include <sys/stat.h>
  35 #include <sys/time.h>
  36 #include <sys/types.h>
  37 #include <time.h>
  38 #include <unistd.h>
  39 #ifdef HAVE_UTIME_H
  40 #include <utime.h>
  41 #endif
  42 #ifdef HAVE_POLL_H
  43 #include <poll.h>
  44 #endif
  45
  46 #include "ntstatus.h"
  47 #define WIN32_NO_STATUS
  48 #include "windef.h"
  49 #include "winternl.h"
  50
  51 #include "file.h"
  52 #include "handle.h"
  53 #include "thread.h"
  54 #include "request.h"
  55 #include "process.h"
  56 #include "security.h"
  57
  58 struct file
  59 {
  60     struct object       obj;        /* object header */
  61     struct fd          *fd;         /* file descriptor for this file */
  62     unsigned int        access;     /* file access (FILE_READ_DATA etc.) */
  63     mode_t              mode;       /* file stat.st_mode */
  64     uid_t               uid;        /* file stat.st_uid */
  65 };
  66
  67 static unsigned int generic_file_map_access( unsigned int access );
  68
  69 static void file_dump( struct object *obj, int verbose );
  70 static struct fd *file_get_fd( struct object *obj );
  71 static struct security_descriptor *file_get_sd( struct object *obj );
  72 static int file_set_sd( struct object *obj, const struct security_descriptor *sd, unsigned int set_info );
  73 static void file_destroy( struct object *obj );
  74
  75 static int file_get_poll_events( struct fd *fd );
  76 static void file_flush( struct fd *fd, struct event **event );
  77 static enum server_fd_type file_get_fd_type( struct fd *fd );
  78
  79 static const struct object_ops file_ops =
  80 {
  81     sizeof(struct file),          /* size */
  82     file_dump,                    /* dump */
  83     no_get_type,                  /* get_type */
  84     add_queue,                    /* add_queue */
  85     remove_queue,                 /* remove_queue */
  86     default_fd_signaled,          /* signaled */
  87     no_satisfied,                 /* satisfied */
  88     no_signal,                    /* signal */
  89     file_get_fd,                  /* get_fd */
  90     default_fd_map_access,        /* map_access */
  91     file_get_sd,                  /* get_sd */
  92     file_set_sd,                  /* set_sd */
  93     no_lookup_name,               /* lookup_name */
  94     no_open_file,                 /* open_file */
  95     fd_close_handle,              /* close_handle */
  96     file_destroy                  /* destroy */
  97 };
  98
  99 static const struct fd_ops file_fd_ops =
 100 {
 101     file_get_poll_events,         /* get_poll_events */
 102     default_poll_event,           /* poll_event */
 103     file_flush,                   /* flush */
 104     file_get_fd_type,             /* get_fd_type */
 105     default_fd_ioctl,             /* ioctl */
 106     default_fd_queue_async,       /* queue_async */
 107     default_fd_reselect_async,    /* reselect_async */
 108     default_fd_cancel_async       /* cancel_async */
 109 };
 110
 111 static inline int is_overlapped( const struct file *file )
 112 {
 113     return !(get_fd_options( file->fd ) & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 114 }
 115
 116 /* create a file from a file descriptor */
 117 /* if the function fails the fd is closed */
 118 struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
 119 {
 120     struct file *file;
 121     struct stat st;
 122
 123     if (fstat( fd, &st ) == -1)
 124     {
 125         file_set_error();
 126         return NULL;
 127     }
 128
 129     if ((file = alloc_object( &file_ops )))
 130     {
 131         file->mode = st.st_mode;
 132         file->access = default_fd_map_access( &file->obj, access );
 133         if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj,
 134                                               FILE_SYNCHRONOUS_IO_NONALERT )))
 135         {
 136             release_object( file );
 137             return NULL;
 138         }
 139         allow_fd_caching( file->fd );
 140     }
 141     return file;
 142 }
 143
 144 static struct object *create_file_obj( struct fd *fd, unsigned int access, mode_t mode )
 145 {
 146     struct file *file = alloc_object( &file_ops );
 147
 148     if (!file) return NULL;
 149     file->access  = access;
 150     file->mode    = mode;
 151     file->uid     = ~(uid_t)0;
 152     file->fd      = fd;
 153     grab_object( fd );
 154     set_fd_user( fd, &file_fd_ops, &file->obj );
 155     return &file->obj;
 156 }
 157
 158 static struct object *create_file( struct fd *root, const char *nameptr, data_size_t len,
 159                                    unsigned int access, unsigned int sharing, int create,
 160                                    unsigned int options, unsigned int attrs,
 161                                    const struct security_descriptor *sd )
 162 {
 163     struct object *obj = NULL;
 164     struct fd *fd;
 165     int flags;
 166     char *name;
 167     mode_t mode;
 168
 169     if (!len || ((nameptr[0] == '/') ^ !root))
 170     {
 171         set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
 172         return NULL;
 173     }
 174     if (!(name = mem_alloc( len + 1 ))) return NULL;
 175     memcpy( name, nameptr, len );
 176     name[len] = 0;
 177
 178     switch(create)
 179     {
 180     case FILE_CREATE:       flags = O_CREAT | O_EXCL; break;
 181     case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
 182     case FILE_SUPERSEDE:    flags = O_CREAT | O_TRUNC; break;
 183     case FILE_OPEN:         flags = 0; break;
 184     case FILE_OPEN_IF:      flags = O_CREAT; break;
 185     case FILE_OVERWRITE:    flags = O_TRUNC; break;
 186     default:                set_error( STATUS_INVALID_PARAMETER ); goto done;
 187     }
 188
 189     if (sd)
 190     {
 191         const SID *owner = sd_get_owner( sd );
 192         if (!owner)
 193             owner = token_get_user( current->process->token );
 194         mode = sd_to_mode( sd, owner );
 195     }
 196     else
 197         mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
 198
 199     if (len >= 4 &&
 200         (!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
 201     {
 202         if (mode & S_IRUSR)
 203             mode |= S_IXUSR;
 204         if (mode & S_IRGRP)
 205             mode |= S_IXGRP;
 206         if (mode & S_IROTH)
 207             mode |= S_IXOTH;
 208     }
 209
 210     access = generic_file_map_access( access );
 211
 212     /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
 213     fd = open_fd( root, name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options );
 214     if (!fd) goto done;
 215
 216     if (S_ISDIR(mode))
 217         obj = create_dir_obj( fd, access, mode );
 218     else if (S_ISCHR(mode) && is_serial_fd( fd ))
 219         obj = create_serial( fd );
 220     else
 221         obj = create_file_obj( fd, access, mode );
 222
 223     release_object( fd );
 224
 225 done:
 226     free( name );
 227     return obj;
 228 }
 229
 230 /* check if two file objects point to the same file */
 231 int is_same_file( struct file *file1, struct file *file2 )
 232 {
 233     return is_same_file_fd( file1->fd, file2->fd );
 234 }
 235
 236 static void file_dump( struct object *obj, int verbose )
 237 {
 238     struct file *file = (struct file *)obj;
 239     assert( obj->ops == &file_ops );
 240     fprintf( stderr, "File fd=%p\n", file->fd );
 241 }
 242
 243 static int file_get_poll_events( struct fd *fd )
 244 {
 245     struct file *file = get_fd_user( fd );
 246     int events = 0;
 247     assert( file->obj.ops == &file_ops );
 248     if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN;
 249     if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT;
 250     return events;
 251 }
 252
 253 static void file_flush( struct fd *fd, struct event **event )
 254 {
 255     int unix_fd = get_unix_fd( fd );
 256     if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
 257 }
 258
 259 static enum server_fd_type file_get_fd_type( struct fd *fd )
 260 {
 261     struct file *file = get_fd_user( fd );
 262
 263     if (S_ISREG(file->mode) || S_ISBLK(file->mode)) return FD_TYPE_FILE;
 264     if (S_ISDIR(file->mode)) return FD_TYPE_DIR;
 265     return FD_TYPE_CHAR;
 266 }
 267
 268 static struct fd *file_get_fd( struct object *obj )
 269 {
 270     struct file *file = (struct file *)obj;
 271     assert( obj->ops == &file_ops );
 272     return (struct fd *)grab_object( file->fd );
 273 }
 274
 275 static unsigned int generic_file_map_access( unsigned int access )
 276 {
 277     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 278     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 279     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 280     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 281     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 282 }
 283
 284 struct security_descriptor *mode_to_sd( mode_t mode, const SID *user, const SID *group )
 285 {
 286     struct security_descriptor *sd;
 287     size_t dacl_size;
 288     ACE_HEADER *current_ace;
 289     ACCESS_ALLOWED_ACE *aaa;
 290     ACL *dacl;
 291     SID *sid;
 292     char *ptr;
 293     const SID *world_sid = security_world_sid;
 294     const SID *local_system_sid = security_local_system_sid;
 295
 296     dacl_size = sizeof(ACL) + FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 297         FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]);
 298     if (mode & S_IRWXU)
 299         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 300             FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 301     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 302         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 303         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 304         dacl_size += FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) +
 305             FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 306     if (mode & S_IRWXO)
 307         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 308             FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]);
 309
 310     sd = mem_alloc( sizeof(struct security_descriptor) +
 311                     FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) +
 312                     FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]) +
 313                     dacl_size );
 314     if (!sd) return sd;
 315
 316     sd->control = SE_DACL_PRESENT;
 317     sd->owner_len = FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 318     sd->group_len = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
 319     sd->sacl_len = 0;
 320     sd->dacl_len = dacl_size;
 321
 322     ptr = (char *)(sd + 1);
 323     memcpy( ptr, user, sd->owner_len );
 324     ptr += sd->owner_len;
 325     memcpy( ptr, group, sd->group_len );
 326     ptr += sd->group_len;
 327
 328     dacl = (ACL *)ptr;
 329     dacl->AclRevision = ACL_REVISION;
 330     dacl->Sbz1 = 0;
 331     dacl->AclSize = dacl_size;
 332     dacl->AceCount = 1 + (mode & S_IRWXU ? 1 : 0) + (mode & S_IRWXO ? 1 : 0);
 333     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 334         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 335         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 336         dacl->AceCount++;
 337     dacl->Sbz2 = 0;
 338
 339     /* always give FILE_ALL_ACCESS for Local System */
 340     aaa = (ACCESS_ALLOWED_ACE *)(dacl + 1);
 341     current_ace = &aaa->Header;
 342     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 343     aaa->Header.AceFlags = 0;
 344     aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 345         FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]);
 346     aaa->Mask = FILE_ALL_ACCESS;
 347     sid = (SID *)&aaa->SidStart;
 348     memcpy( sid, local_system_sid, FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]) );
 349
 350     if (mode & S_IRWXU)
 351     {
 352         /* appropriate access rights for the user */
 353         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 354         current_ace = &aaa->Header;
 355         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 356         aaa->Header.AceFlags = 0;
 357         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 358                               FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 359         aaa->Mask = WRITE_DAC | WRITE_OWNER;
 360         if (mode & S_IRUSR)
 361             aaa->Mask |= FILE_GENERIC_READ;
 362         if (mode & S_IWUSR)
 363             aaa->Mask |= FILE_GENERIC_WRITE | DELETE;
 364         if (mode & S_IXUSR)
 365             aaa->Mask |= FILE_GENERIC_EXECUTE;
 366         sid = (SID *)&aaa->SidStart;
 367         memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 368     }
 369     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 370         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 371         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 372     {
 373         /* deny just in case the user is a member of the group */
 374         ACCESS_DENIED_ACE *ada = (ACCESS_DENIED_ACE *)ace_next( current_ace );
 375         current_ace = &ada->Header;
 376         ada->Header.AceType = ACCESS_DENIED_ACE_TYPE;
 377         ada->Header.AceFlags = 0;
 378         ada->Header.AceSize = FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) +
 379                               FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 380         ada->Mask = 0;
 381         if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
 382             ada->Mask |= FILE_GENERIC_READ;
 383         if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IROTH)))
 384             ada->Mask |= FILE_GENERIC_WRITE | DELETE;
 385         if (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH)))
 386             ada->Mask |= FILE_GENERIC_EXECUTE;
 387         ada->Mask &= ~STANDARD_RIGHTS_ALL; /* never deny standard rights */
 388         sid = (SID *)&ada->SidStart;
 389         memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 390     }
 391     if (mode & S_IRWXO)
 392     {
 393         /* appropriate access rights for Everyone */
 394         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 395         current_ace = &aaa->Header;
 396         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 397         aaa->Header.AceFlags = 0;
 398         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 399                              FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]);
 400         aaa->Mask = 0;
 401         if (mode & S_IROTH)
 402             aaa->Mask |= FILE_GENERIC_READ;
 403         if (mode & S_IWOTH)
 404             aaa->Mask |= FILE_GENERIC_WRITE | DELETE;
 405         if (mode & S_IXOTH)
 406             aaa->Mask |= FILE_GENERIC_EXECUTE;
 407         sid = (SID *)&aaa->SidStart;
 408         memcpy( sid, world_sid, FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]) );
 409     }
 410
 411     return sd;
 412 }
 413
 414 static struct security_descriptor *file_get_sd( struct object *obj )
 415 {
 416     struct file *file = (struct file *)obj;
 417     struct stat st;
 418     int unix_fd;
 419     struct security_descriptor *sd;
 420
 421     assert( obj->ops == &file_ops );
 422
 423     unix_fd = get_file_unix_fd( file );
 424
 425     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
 426         return obj->sd;
 427
 428     /* mode and uid the same? if so, no need to re-generate security descriptor */
 429     if (obj->sd && (st.st_mode & (S_IRWXU|S_IRWXO)) == (file->mode & (S_IRWXU|S_IRWXO)) &&
 430         (st.st_uid == file->uid))
 431         return obj->sd;
 432
 433     sd = mode_to_sd( st.st_mode,
 434                      security_unix_uid_to_sid( st.st_uid ),
 435                      token_get_primary_group( current->process->token ));
 436     if (!sd) return obj->sd;
 437
 438     file->mode = st.st_mode;
 439     file->uid = st.st_uid;
 440     free( obj->sd );
 441     obj->sd = sd;
 442     return sd;
 443 }
 444
 445 static mode_t file_access_to_mode( unsigned int access )
 446 {
 447     mode_t mode = 0;
 448
 449     access = generic_file_map_access( access );
 450     if (access & FILE_READ_DATA)  mode |= 4;
 451     if (access & FILE_WRITE_DATA) mode |= 2;
 452     if (access & FILE_EXECUTE)    mode |= 1;
 453     return mode;
 454 }
 455
 456 mode_t sd_to_mode( const struct security_descriptor *sd, const SID *owner )
 457 {
 458     mode_t new_mode = 0;
 459     mode_t denied_mode = 0;
 460     mode_t mode;
 461     int present;
 462     const ACL *dacl = sd_get_dacl( sd, &present );
 463     const SID *user = token_get_user( current->process->token );
 464     if (present && dacl)
 465     {
 466         const ACE_HEADER *ace = (const ACE_HEADER *)(dacl + 1);
 467         ULONG i;
 468         for (i = 0; i < dacl->AceCount; i++, ace = ace_next( ace ))
 469         {
 470             const ACCESS_ALLOWED_ACE *aa_ace;
 471             const ACCESS_DENIED_ACE *ad_ace;
 472             const SID *sid;
 473
 474             if (ace->AceFlags & INHERIT_ONLY_ACE) continue;
 475
 476             switch (ace->AceType)
 477             {
 478                 case ACCESS_DENIED_ACE_TYPE:
 479                     ad_ace = (const ACCESS_DENIED_ACE *)ace;
 480                     sid = (const SID *)&ad_ace->SidStart;
 481                     mode = file_access_to_mode( ad_ace->Mask );
 482                     if (security_equal_sid( sid, security_world_sid ))
 483                     {
 484                         denied_mode |= (mode << 6) | (mode << 3) | mode; /* all */
 485                     }
 486                     else if (security_equal_sid( sid, owner ))
 487                     {
 488                         denied_mode |= (mode << 6);  /* user only */
 489                     }
 490                     else if ((security_equal_sid( user, owner ) &&
 491                               token_sid_present( current->process->token, sid, TRUE )))
 492                     {
 493                         denied_mode |= (mode << 6) | (mode << 3);  /* user + group */
 494                     }
 495                     break;
 496                 case ACCESS_ALLOWED_ACE_TYPE:
 497                     aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
 498                     sid = (const SID *)&aa_ace->SidStart;
 499                     mode = file_access_to_mode( aa_ace->Mask );
 500                     if (security_equal_sid( sid, security_world_sid ))
 501                     {
 502                         new_mode |= (mode << 6) | (mode << 3) | mode;  /* all */
 503                     }
 504                     else if (security_equal_sid( sid, owner ))
 505                     {
 506                         new_mode |= (mode << 6);  /* user only */
 507                     }
 508                     else if ((security_equal_sid( user, owner ) &&
 509                               token_sid_present( current->process->token, sid, FALSE )))
 510                     {
 511                         new_mode |= (mode << 6) | (mode << 3);  /* user + group */
 512                     }
 513                     break;
 514             }
 515         }
 516     }
 517     else
 518         /* no ACL means full access rights to anyone */
 519         new_mode = S_IRWXU | S_IRWXG | S_IRWXO;
 520
 521     return new_mode & ~denied_mode;
 522 }
 523
 524 static int file_set_sd( struct object *obj, const struct security_descriptor *sd,
 525                         unsigned int set_info )
 526 {
 527     struct file *file = (struct file *)obj;
 528     const SID *owner;
 529     struct stat st;
 530     mode_t mode;
 531     int unix_fd;
 532
 533     assert( obj->ops == &file_ops );
 534
 535     unix_fd = get_file_unix_fd( file );
 536
 537     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
 538
 539     if (set_info & OWNER_SECURITY_INFORMATION)
 540     {
 541         owner = sd_get_owner( sd );
 542         if (!owner)
 543         {
 544             set_error( STATUS_INVALID_SECURITY_DESCR );
 545             return 0;
 546         }
 547         if (!obj->sd || !security_equal_sid( owner, sd_get_owner( obj->sd ) ))
 548         {
 549             /* FIXME: get Unix uid and call fchown */
 550         }
 551     }
 552     else if (obj->sd)
 553         owner = sd_get_owner( obj->sd );
 554     else
 555         owner = token_get_user( current->process->token );
 556
 557     /* group and sacl not supported */
 558
 559     if (set_info & DACL_SECURITY_INFORMATION)
 560     {
 561         /* keep the bits that we don't map to access rights in the ACL */
 562         mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
 563         mode |= sd_to_mode( sd, owner );
 564
 565         if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)
 566         {
 567             file_set_error();
 568             return 0;
 569         }
 570     }
 571     return 1;
 572 }
 573
 574 static void file_destroy( struct object *obj )
 575 {
 576     struct file *file = (struct file *)obj;
 577     assert( obj->ops == &file_ops );
 578
 579     if (file->fd) release_object( file->fd );
 580 }
 581
 582 /* set the last error depending on errno */
 583 void file_set_error(void)
 584 {
 585     switch (errno)
 586     {
 587     case ETXTBSY:
 588     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
 589     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
 590     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;
 591     case EACCES:
 592     case ESRCH:
 593     case EROFS:
 594     case EPERM:     set_error( STATUS_ACCESS_DENIED ); break;
 595     case EBUSY:     set_error( STATUS_FILE_LOCK_CONFLICT ); break;
 596     case ENOENT:    set_error( STATUS_NO_SUCH_FILE ); break;
 597     case EISDIR:    set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
 598     case ENFILE:
 599     case EMFILE:    set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
 600     case EEXIST:    set_error( STATUS_OBJECT_NAME_COLLISION ); break;
 601     case EINVAL:    set_error( STATUS_INVALID_PARAMETER ); break;
 602     case ESPIPE:    set_error( STATUS_ILLEGAL_FUNCTION ); break;
 603     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
 604     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
 605     case ENOTDIR:   set_error( STATUS_NOT_A_DIRECTORY ); break;
 606     case EFBIG:     set_error( STATUS_SECTION_TOO_BIG ); break;
 607     case ENODEV:    set_error( STATUS_NO_SUCH_DEVICE ); break;
 608     case ENXIO:     set_error( STATUS_NO_SUCH_DEVICE ); break;
 609 #ifdef EOVERFLOW
 610     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
 611 #endif
 612     default:
 613         perror("wineserver: file_set_error() can't map error");
 614         set_error( STATUS_UNSUCCESSFUL );
 615         break;
 616     }
 617 }
 618
 619 struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
 620 {
 621     return (struct file *)get_handle_obj( process, handle, access, &file_ops );
 622 }
 623
 624 int get_file_unix_fd( struct file *file )
 625 {
 626     return get_unix_fd( file->fd );
 627 }
 628
 629 struct file *grab_file_unless_removable( struct file *file )
 630 {
 631     if (is_fd_removable( file->fd )) return NULL;
 632     return (struct file *)grab_object( file );
 633 }
 634
 635 /* create a file */
 636 DECL_HANDLER(create_file)
 637 {
 638     struct object *file;
 639     struct fd *root_fd = NULL;
 640     const struct object_attributes *objattr = get_req_data();
 641     const struct security_descriptor *sd;
 642     const char *name;
 643     data_size_t name_len;
 644
 645     reply->handle = 0;
 646
 647     if (!objattr_is_valid( objattr, get_req_data_size() ))
 648         return;
 649     /* name is transferred in the unix codepage outside of the objattr structure */
 650     if (objattr->name_len)
 651     {
 652         set_error( STATUS_INVALID_PARAMETER );
 653         return;
 654     }
 655
 656     if (objattr->rootdir)
 657     {
 658         struct dir *root;
 659
 660         if (!(root = get_dir_obj( current->process, objattr->rootdir, 0 ))) return;
 661         root_fd = get_obj_fd( (struct object *)root );
 662         release_object( root );
 663         if (!root_fd) return;
 664     }
 665
 666     sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
 667
 668     name = (const char *)get_req_data() + sizeof(*objattr) + objattr->sd_len;
 669     name_len = get_req_data_size() - sizeof(*objattr) - objattr->sd_len;
 670
 671     reply->handle = 0;
 672     if ((file = create_file( root_fd, name, name_len, req->access, req->sharing,
 673                              req->create, req->options, req->attrs, sd )))
 674     {
 675         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 676         release_object( file );
 677     }
 678     if (root_fd) release_object( root_fd );
 679 }
 680
 681 /* allocate a file handle for a Unix fd */
 682 DECL_HANDLER(alloc_file_handle)
 683 {
 684     struct file *file;
 685     int fd;
 686
 687     reply->handle = 0;
 688     if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
 689     {
 690         set_error( STATUS_INVALID_HANDLE );
 691         return;
 692     }
 693     if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
 694     {
 695         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 696         release_object( file );
 697     }
 698 }
 699
 700 /* lock a region of a file */
 701 DECL_HANDLER(lock_file)
 702 {
 703     struct file *file;
 704
 705     if ((file = get_file_obj( current->process, req->handle, 0 )))
 706     {
 707         reply->handle = lock_fd( file->fd, req->offset, req->count, req->shared, req->wait );
 708         reply->overlapped = is_overlapped( file );
 709         release_object( file );
 710     }
 711 }
 712
 713 /* unlock a region of a file */
 714 DECL_HANDLER(unlock_file)
 715 {
 716     struct file *file;
 717
 718     if ((file = get_file_obj( current->process, req->handle, 0 )))
 719     {
 720         unlock_fd( file->fd, req->offset, req->count );
 721         release_object( file );
 722     }
 723 }